[ARM] 3120/1: Fix MMC/SD card driver resume deadlock

Patch from Uli Luckas

This is a simplification of patch 3116/1 as sugested by Russell King.

Signed-off-by: Uli Luckas <u.luckas@road-gmbh.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>